When you generate a rails scaffold using a command like rails g scaffold Thing
is there any way to avoid getting that annoying
respond_to do |format
You'll notice that the JSON response is coded directly into the template for the rails generator here:
https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/scaffold_controller/templates/controller.rb
I think something to note is that the scaffold generator is really intended to illustrate and moreover educate on how the Rails stack works, it shows how you can edit the controller to provide many different formats to suit your needs!